Had one, don't any longer. I don't have the link, but you can download the manual off the Olympic Arms website. Should have a schematic there.They really don't have a buffer, they work with a recoil spring / operating rod connecting to the top of the bolt carrier. Carrier is a dedicated item (OA only, no substitutions), it is shorter than mil-spec because it has no buffer tube to go into.The one I had was a great shooter, I just decided that the non-spec parts and the un-necessity of a folding stock on a rifle weren't for me. YMMV

No gas piston on this the OA93 systems, they're direct impingement. You can see the gas tube in it's usual location.Instead of the standard AR spring/ buffer assy, the OA has an operating rod and spring over the bbl. and receiver. That's why there's no buffer tube.Oly doesn't have a big following on this site, but there is a dedicated Oly Owners Group. You might get a better response there.Here's another site with some info you might be interested in